/*
* Copyright (C) 2007 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.inject.internal;
import static com.google.common.base.Preconditions.checkState;
import static com.google.inject.internal.Annotations.findScopeAnnotation;
import static com.google.inject.internal.RehashableKeys.Keys.needsRehashing;
import static com.google.inject.internal.RehashableKeys.Keys.rehash;
import com.google.common.base.Objects;
import com.google.common.collect.ImmutableSet;
import com.google.inject.Binder;
import com.google.inject.ConfigurationException;
import com.google.inject.Inject;
import com.google.inject.Key;
import com.google.inject.TypeLiteral;
import com.google.inject.internal.util.Classes;
import com.google.inject.spi.BindingTargetVisitor;
import com.google.inject.spi.ConstructorBinding;
import com.google.inject.spi.Dependency;
import com.google.inject.spi.InjectionPoint;
import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.List;
import java.util.Map;
import java.util.Set;
final class ConstructorBindingImpl<T> extends BindingImpl<T>
implements ConstructorBinding<T>, DelayedInitialize {
private final Factory<T> factory;
private final InjectionPoint constructorInjectionPoint;
private ConstructorBindingImpl(InjectorImpl injector, Key<T> key, Object source,
InternalFactory<? extends T> scopedFactory, Scoping scoping, Factory<T> factory,
InjectionPoint constructorInjectionPoint) {
super(injector, key, source, scopedFactory, scoping);
this.factory = factory;
this.constructorInjectionPoint = constructorInjectionPoint;
}
public ConstructorBindingImpl(Key<T> key, Object source, Scoping scoping,
InjectionPoint constructorInjectionPoint, Set<InjectionPoint> injectionPoints) {
super(source, key, scoping);
this.factory = new Factory<T>(false, key);
ConstructionProxy<T> constructionProxy
= new DefaultConstructionProxyFactory<T>(constructorInjectionPoint).create();
this.constructorInjectionPoint = constructorInjectionPoint;
factory.constructorInjector = new ConstructorInjector<T>(
injectionPoints, constructionProxy, null, null);
}
/**
* @param constructorInjector the constructor to use, or {@code null} to use the default.
* @param failIfNotLinked true if this ConstructorBindingImpl's InternalFactory should
* only succeed if retrieved from a linked binding
*/
static <T> ConstructorBindingImpl<T> create(InjectorImpl injector, Key<T> key,
InjectionPoint constructorInjector, Object source, Scoping scoping, Errors errors,
boolean failIfNotLinked, boolean failIfNotExplicit)
throws ErrorsException {
int numErrors = errors.size();
@SuppressWarnings("unchecked") // constructorBinding guarantees type is consistent
Class<? super T> rawType = constructorInjector == null
? key.getTypeLiteral().getRawType()
: (Class) constructorInjector.getDeclaringType().getRawType();
// We can't inject abstract classes.
if (Modifier.isAbstract(rawType.getModifiers())) {
errors.missingImplementation(key);
}
// Error: Inner class.
if (Classes.isInnerClass(rawType)) {
errors.cannotInjectInnerClass(rawType);
}
errors.throwIfNewErrors(numErrors);
// Find a constructor annotated @Inject
if (constructorInjector == null) {
try {
constructorInjector = InjectionPoint.forConstructorOf(key.getTypeLiteral());
if (failIfNotExplicit && !hasAtInject((Constructor) constructorInjector.getMember())) {
errors.atInjectRequired(rawType);
}
} catch (ConfigurationException e) {
throw errors.merge(e.getErrorMessages()).toException();
}
}
// if no scope is specified, look for a scoping annotation on the concrete class
if (!scoping.isExplicitlyScoped()) {
Class<?> annotatedType = constructorInjector.getMember().getDeclaringClass();
Class<? extends Annotation> scopeAnnotation = findScopeAnnotation(errors, annotatedType);
if (scopeAnnotation != null) {
scoping = Scoping.makeInjectable(Scoping.forAnnotation(scopeAnnotation),
injector, errors.withSource(rawType));
}
}
errors.throwIfNewErrors(numErrors);
Factory<T> factoryFactory = new Factory<T>(failIfNotLinked, key);
InternalFactory<? extends T> scopedFactory
= Scoping.scope(key, injector, factoryFactory, source, scoping);
return new ConstructorBindingImpl<T>(
injector, key, source, scopedFactory, scoping, factoryFactory, constructorInjector);
}
/** Returns true if the inject annotation is on the constructor. */
private static boolean hasAtInject(Constructor cxtor) {
return cxtor.isAnnotationPresent(Inject.class)
|| cxtor.isAnnotationPresent(javax.inject.Inject.class);
}
@SuppressWarnings("unchecked") // the result type always agrees with the ConstructorInjector type
public void initialize(InjectorImpl injector, Errors errors) throws ErrorsException {
factory.allowCircularProxy = !injector.options.disableCircularProxies;
factory.constructorInjector =
(ConstructorInjector<T>) injector.constructors.get(constructorInjectionPoint, errors);
factory.provisionCallback =
injector.provisionListenerStore.get(this);
}
/** True if this binding has been initialized and is ready for use. */
boolean isInitialized() {
return factory.constructorInjector != null;
}
/** Returns an injection point that can be used to clean up the constructor store. */
InjectionPoint getInternalConstructor() {
if(factory.constructorInjector != null) {
return factory.constructorInjector.getConstructionProxy().getInjectionPoint();
} else {
return constructorInjectionPoint;
}
}
/** Returns a set of dependencies that can be iterated over to clean up stray JIT bindings. */
Set<Dependency<?>> getInternalDependencies() {
ImmutableSet.Builder<InjectionPoint> builder = ImmutableSet.builder();
if(factory.constructorInjector == null) {
builder.add(constructorInjectionPoint);
// If the below throws, it's OK -- we just ignore those dependencies, because no one
// could have used them anyway.
try {
builder.addAll(InjectionPoint.forInstanceMethodsAndFields(constructorInjectionPoint.getDeclaringType()));
} catch(ConfigurationException ignored) {}
} else {
builder.add(getConstructor())
.addAll(getInjectableMembers());
}
return Dependency.forInjectionPoints(builder.build());
}
public <V> V acceptTargetVisitor(BindingTargetVisitor<? super T, V> visitor) {
checkState(factory.constructorInjector != null, "not initialized");
return visitor.visit(this);
}
public InjectionPoint getConstructor() {
checkState(factory.constructorInjector != null, "Binding is not ready");
return factory.constructorInjector.getConstructionProxy().getInjectionPoint();
}
public Set<InjectionPoint> getInjectableMembers() {
checkState(factory.constructorInjector != null, "Binding is not ready");
return factory.constructorInjector.getInjectableMembers();
}
/*if[AOP]*/
public Map<Method, List<org.aopalliance.intercept.MethodInterceptor>> getMethodInterceptors() {
checkState(factory.constructorInjector != null, "Binding is not ready");
return factory.constructorInjector.getConstructionProxy().getMethodInterceptors();
}
/*end[AOP]*/
public Set<Dependency<?>> getDependencies() {
return Dependency.forInjectionPoints(new ImmutableSet.Builder<InjectionPoint>()
.add(getConstructor())
.addAll(getInjectableMembers())
.build());
}
@Override protected BindingImpl<T> withScoping(Scoping scoping) {
return new ConstructorBindingImpl<T>(
null, getKey(), getSource(), factory, scoping, factory, constructorInjectionPoint);
}
@Override protected BindingImpl<T> withKey(Key<T> key) {
return new ConstructorBindingImpl<T>(
null, key, getSource(), factory, getScoping(), factory, constructorInjectionPoint);
}
@Override public BindingImpl<T> withRehashedKeys() {
if (needsRehashing(getKey())) {
return withKey(rehash(getKey()));
} else {
return this;
}
}
@SuppressWarnings("unchecked") // the raw constructor member and declaring type always agree
public void applyTo(Binder binder) {
InjectionPoint constructor = getConstructor();
getScoping().applyTo(binder.withSource(getSource()).bind(getKey()).toConstructor(
(Constructor) getConstructor().getMember(), (TypeLiteral) constructor.getDeclaringType()));
}
@Override public String toString() {
return Objects.toStringHelper(ConstructorBinding.class)
.add("key", getKey())
.add("source", getSource())
.add("scope", getScoping())
.toString();
}
@Override
public boolean equals(Object obj) {
if(obj instanceof ConstructorBindingImpl) {
ConstructorBindingImpl<?> o = (ConstructorBindingImpl<?>)obj;
return getKey().equals(o.getKey())
&& getScoping().equals(o.getScoping())
&& Objects.equal(constructorInjectionPoint, o.constructorInjectionPoint);
} else {
return false;
}
}
@Override
public int hashCode() {
return Objects.hashCode(getKey(), getScoping(), constructorInjectionPoint);
}
private static class Factory<T> implements InternalFactory<T> {
private final boolean failIfNotLinked;
private final Key<?> key;
private boolean allowCircularProxy;
private ConstructorInjector<T> constructorInjector;
private ProvisionListenerStackCallback<T> provisionCallback;
Factory(boolean failIfNotLinked, Key<?> key) {
this.failIfNotLinked = failIfNotLinked;
this.key = key;
}
@SuppressWarnings("unchecked")
public T get(Errors errors, InternalContext context, Dependency<?> dependency, boolean linked)
throws ErrorsException {
checkState(constructorInjector != null, "Constructor not ready");
if(failIfNotLinked && !linked) {
throw errors.jitDisabled(key).toException();
}
// This may not actually be safe because it could return a super type of T (if that's all the
// client needs), but it should be OK in practice thanks to the wonders of erasure.
return (T) constructorInjector.construct(errors, context,
dependency.getKey().getTypeLiteral().getRawType(), allowCircularProxy, provisionCallback);
}
}
}